608zz bearing guide
thingiverse
Here is a Very Simple Printable Guide for a 608zz Bearing: Just place a GT2 belt or whatever you prefer, into one of the two grooves in this part - simple and effective. This guide needs to be thin and loose-fitting, allowing the belt to easily fit without slipping around. I've added just enough flexibility so it's not necessary for these parts to be highly accurate.
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